18/8.] MR. M. JACOBY ON PHYTOPHAGOUS COLEOPTERA. 983 



constricted behind the middle, smooth, impunctate, testaceous ; seu- 

 tellum subquadrate, black. Elytra strongly and very regularly 

 piuictate-striate, the ninth stria entire, the interstices slightly raised 

 towards the apex ; a short longitudinal sutural stripe at the base, 

 another of equal length covering the shoulder and pointed posteriorly, 

 where both stripes finish a little before the middle, a small round 

 spot between these stripes at their end, and another spot at a, little 

 distance from the apex of each elytron, shining violaceous black. 

 Abdomen and the legs testaceous. 



Hab. Volcano of Irazu, Costa Rica. 



Collected by Mr. Rogers. 



This species bears a close resemblance to L. bifida, Oliv., and 

 L. semisepta, Lac, in coloration, but is distinguished from the 

 first by the elytra having two spots instead of one, the uniformly 

 coloured antennae and the smooth thorax, while the same differences 

 distinguish it from the latter species. I have seen about a dozen 

 specimens, all of which agree exactly with each other in having the 

 light-coloured antennas and legs and the two spots on each elytron. 



2. Mastostethus salvini, sp. nov. 



Elongate, parallel, testaceous, the sides of the breast and the 

 upper part of the head shining black. Thorax rufous, nitidous. 

 Elytra light testaceous, a large semiquadrate patch from the base to 

 the middle on each, and a broad transverse fascia behind the middle, 

 common to both elytra, black. 



Length A\ lines. 



Head distinctly punctured round the eyes, the other part smooth 

 and shining, lower part of face flavous, upper part black ; antennae 

 reaching to the base of the thorax, testaceous, the first to the eighth 

 joint above stained with black, but diminishing towards the apex, 

 and entirely disappearing from the ninth joint. Thorax narrowed 

 from the base to the apex ; surface very minutely and widely punc- 

 tured, impressed near the hinder angles with a distinct fovea j 

 scutellum black. Elytra subdepressed above, narrowed towards the 

 apex, surface strongly but not very closely punctured ; pale testa- 

 ceous, a large spot on each elytron from the base to the middle, 

 narrowed towards the suture, and a transverse fascia (neither of 

 which extends quite to the lateral margin), the latter only separated 

 from the former by a narrow interval, with the posterior margin 

 irregular, black ; the apex of the elytra are of the ground-colour to 

 about the same extent as the width of the transverse band. The 

 underside, with the exception of the sides of the breast, the dorsal 

 surface of the four anterior femora, and all the tibiae, which are 

 black, testaceous ; hinder femora and inner side of tibiae of the same 

 colour, the former with a distinct tooth near the apex. 



Hab. Cache, Costa Rica. 



Collected by Mr. Rogers. 



3. Lamprosoma chapuisi, sp. nov. 



Ovate, convex, dark violaceous ; head, lateral and anterior margins 



64* 



